Significatio vocis Zonus | Babel Free

Definitiones

A river flowing into the Caspian Sea, mentioned by Pliny; perhaps an alternative name for the Oxus (modern Amu Darya)

declension-2, masculine, singular

Exempla

“inde per Anariacos, Amardos, Hyrcanos ad ostium Zoni fluminis IIII DCCC,”

thence, through the territories of the Anariaci, the Amardi, and the Hyrcani, to the mouth of the river Zonus he makes four thousand eight hundred stadia,

Gradus CEFR